*{
    margin: 0;
    padding: 0;
}
.left{
    position: fixed;
    left: 0;
    width: 200px;
    height: 100%;
}
.top{
    position: fixed;
    left: 200px;
    top: 0;
    width: 100%;
}
.list{
    position: fixed;
    left: 200px;
    top: 200px;
    width: 100%;
    height: 100%;
}
